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chlorophyll, chlorophyl

(klōr′ŏ-fil″) [chloro- + Gr. phyllon, leaf] The green pigment in plants that accomplishes photosynthesis. In this process, carbon dioxide (CO2) and water (H2O) are combined to form glucose and oxygen according to the following equation: 6 CO2 + 6 H2O + light → C6H12O6 + 6 O2. The primary energy source for our planet is the sunlight absorbed by chlorophyll. Four forms of chlorophyll (a, b, c, and d) occur in nature.

chloroplast, chloroplastid

(klōrŏ-plast″, klōr″ŏ-plas′tĭd) [chloro- + -plast] A small green cell organelle found in the leaves and some stems of plants. Chloroplasts are the sites of photosynthesis. They possess a stroma and contain four pigments: chlorophyll a, chlorophyll b, carotene, and xanthophyll.

ChM

CHN

choana

(kō″ă-nă) pl.choanae [Gr. choanē, funnel] A funnel-shaped opening, esp. of the posterior nares (either of the two communicating passageways between the nasal fossae and the pharynx). choanal (-năl), adj.

choke

choked disk

chokes

(chōkz) Respiratory symptoms such as substernal distress, paroxysmal cough, tachypnea, or asphyxia. These may occur in decompression illness, esp. in cases of aeroembolism resulting from exposure to pressure lower than atmospheric.